Free deliverability tools

Audit your domain in seconds. Run real DNS lookups on SPF, DKIM, DMARC, MX, blacklists and verify email addresses — no signup required.

Validate Sender Policy Framework records.

Check DKIM signing keys on any selector.

Inspect DMARC policy, alignment, reporting.

MX Record Lookup

See mail servers and identify the provider.

Blacklist Checker

Scan an IP or domain across 10+ DNSBLs.

Syntax, MX, disposable + role detection.